Sahih Al Bukhari (579)

عن عامر قال سمعت النعمان بن بشير رضي الله عنهما وهو على المنبر يقول {أعطاني أبي عطية فقالت عمرة بنت رواحة لا أرضى حتى تشهد رسول الله (صلى الله عليه وسلم) فأتى رسول الله (صلى الله عليه وسلم) فقال إني أعطيت ابني من عمرة بنت رواحة عطية فأمرتني أن أشهدك يا رسول الله قال أعطيت سائر ولدك مثل هذا قال لا قال فاتقوا الله واعدلوا بين أولادكم قال فرجع فرد عطيته}

`Amir reported: I heard An-Nu`man ibn Bashir on the pulpit saying: "My father gave me a gift but `Amra bint Rawaha (my mother) said that she would not agree to it unless he made Allah's Messenger (peace be upon him) as a witness to it. So, my father went to Allah's Messenger (peace be upon him) and said, 'I have given a gift to my son from `Amra bint Rawaha, but she ordered me to make you as a witness to it, O Allah's Messenger!' Allah's Messenger (peace be upon him) asked, 'Have you given (the like of it) to everyone of your sons?' He replied in the negative. Allah's Messenger (peace be upon him) said, 'Be afraid of Allah, and be just to your children.' My father then returned and took back his gift."